What are the characteristics of the layout of soft-pack lithium-ion batteries and square lithium-ion battery packs?

The key materials used in the soft pack lithium-ion battery pack are the positive electrode material, negative electrode material and barriers that are not much different from the traditional steel shell and aluminum shell lithium-ion batteries. The biggest difference lies in the soft packaging material (aluminum-plastic composite film). This is the most critical and technically difficult material in soft-pack lithium-ion batteries. Flexible packaging materials are usually divided into three layers, namely the outer barrier layer (usually the outer protective layer composed of nylon BOPA or PET), the barrier layer (middle layer aluminum foil) and the inner layer (multiple high barrier layer). Advantages of soft-packed lithium-ion batteries: good safety function, soft-packed batteries, unlike steel shell aluminum shell batteries that will produce explosions. Lightweight, the weight of the soft-packed lithium-ion battery pack is 40% lighter than the steel shell lithium battery of the same capacity, and 20% lighter than the aluminum shell battery. Large capacity, the capacity of the soft pack battery is 10-15% higher than that of the steel shell battery of the same size and 5-10% higher than that of the aluminum shell battery. The internal resistance is small, and the internal resistance of the soft-packed lithium-ion battery pack is smaller than that of the lithium-ion battery. At present, the minimum internal resistance of the domestic soft-packed battery core can be less than 35m, which greatly reduces the self-consumption of the battery. The shape of the soft pack battery can be customized according to the needs of customers, and new battery cell models can be developed. Soft-pack polymer lithium-ion battery packs are widely used in consumer electronic products such as smartphones, tablet computers, and wearable devices due to their excellent comprehensive functions, and their rising speed is much higher than the average level of the lithium-ion battery industry. Square lithium-ion battery: The housing of the square hard-shell lithium-ion battery is mostly made of aluminum alloy, stainless steel and other materials. The internal recovery of the winding or lamination process makes the battery core better than aluminum-plastic film batteries (ie soft packs). Battery), the safety of the battery cell has also been greatly improved compared to the cylindrical battery. The prismatic lithium iron phosphate battery pack usually refers to the aluminum shell or steel shell prismatic battery. The popularity of prismatic batteries is very high in the country. With the rise of automobile power lithium batteries for years, the conflict between automobile mileage and battery capacity has become increasingly prominent. , Domestic power lithium battery manufacturers mostly recycle the aluminum shell square battery with higher battery energy density. Layout features of square lithium-ion battery packs: square lithium-ion batteries, important layout components include: top cover, casing, positive plate, negative plate, barriers composed of laminations may be wound, insulators, safety components, etc. The square type is mainly recycled aluminum shell, and the layout is simpler. Unlike the cylindrical battery, which has a higher recovery of stainless steel as the shell and has accessories such as explosion-proof safety valves, the overall accessories are lighter, more reliable, and have a higher relative energy density. high. Square lithium-ion battery packs can be customized according to the size of the product, so there are thousands of models on the market, and because there are too many models, it is difficult to unify the process; the degree of automation of production is not high, and the monomer difference is relatively high. Large, in most limited applications, there is a problem that the life of the system is much lower than the life of the monomer. Advantages of square lithium-ion battery packs: square lithium-ion battery packaging is highly reliable; system energy efficiency is high; relatively light weight, high energy density; simple layout, relatively convenient expansion, it is currently increasing the energy density by increasing the monomer capacity An important option; the capacity of a single unit is large, and the system composition is relatively simple, making it possible to monitor each unit one by one; another benefit brought by the simplicity of the system is relatively good immutability. Statement: Some pictures and content of articles published on this site are from On the Internet, if there is any infringement, please contact to delete the previous article: What is the root cause of the burning and explosion of the soft-pack polymer lithium-ion battery?